The best price found from United States to Brussels is on October 24th, 2017, travelling with WOW air. See more options, compare prices and book: search flights.
Brussels Airport is 14km northeast of Brussels. There are ATMs on most levels and for stamps there’s a post point in the Louis Delhaize grocery. The arrivals hall (Level 2) has currency exchange, car-rental agencies and tourist information. The bus terminus and luggage lockers are on Level 0, the train station on Level 1.
Airport City Express trains run four times hourly between Brussels Airport and the city’s three main train stations, Bruxelles-Nord (15 minutes), Bruxelles-Central (€8.50, 20 minutes) and Bruxelles-Midi (25 minutes). Express bus 12 links the airport to Bruxelles-Luxembourg via Nato HQ and Schuman metro station (prepurchased/bought aboard €3/4). It should take around 30 minutes, but allow much more time at rush hour. After 8pm at weekends, the slower route 21 is substituted. See www.stib.be for the rather complex timetables. An airport taxi to central Brussels costs around €38 (some accept credit cards), but once you’re stuck in rush-hour traffic you’ll probably wish you’d taken the train.